| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* cell.h: AFS cell record |
| 2 | * |
| 3 | * Copyright (C) 2002 Red Hat, Inc. All Rights Reserved. |
| 4 | * Written by David Howells (dhowells@redhat.com) |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU General Public License |
| 8 | * as published by the Free Software Foundation; either version |
| 9 | * 2 of the License, or (at your option) any later version. |
| 10 | */ |
| 11 | |
| 12 | #ifndef _LINUX_AFS_CELL_H |
| 13 | #define _LINUX_AFS_CELL_H |
| 14 | |
| 15 | #include "types.h" |
| 16 | #include "cache.h" |
| 17 | |
| 18 | #define AFS_CELL_MAX_ADDRS 15 |
| 19 | |
| 20 | extern volatile int afs_cells_being_purged; /* T when cells are being purged by rmmod */ |
| 21 | |
| 22 | /*****************************************************************************/ |
| 23 | /* |
| 24 | * entry in the cached cell catalogue |
| 25 | */ |
| 26 | struct afs_cache_cell |
| 27 | { |
| 28 | char name[64]; /* cell name (padded with NULs) */ |
| 29 | struct in_addr vl_servers[15]; /* cached cell VL servers */ |
| 30 | }; |
| 31 | |
| 32 | /*****************************************************************************/ |
| 33 | /* |
| 34 | * AFS cell record |
| 35 | */ |
| 36 | struct afs_cell |
| 37 | { |
| 38 | atomic_t usage; |
| 39 | struct list_head link; /* main cell list link */ |
| 40 | struct list_head proc_link; /* /proc cell list link */ |
| 41 | struct proc_dir_entry *proc_dir; /* /proc dir for this cell */ |
| 42 | #ifdef AFS_CACHING_SUPPORT |
| 43 | struct cachefs_cookie *cache; /* caching cookie */ |
| 44 | #endif |
| 45 | |
| 46 | /* server record management */ |
| 47 | rwlock_t sv_lock; /* active server list lock */ |
| 48 | struct list_head sv_list; /* active server list */ |
| 49 | struct list_head sv_graveyard; /* inactive server list */ |
| 50 | spinlock_t sv_gylock; /* inactive server list lock */ |
| 51 | |
| 52 | /* volume location record management */ |
| 53 | struct rw_semaphore vl_sem; /* volume management serialisation semaphore */ |
| 54 | struct list_head vl_list; /* cell's active VL record list */ |
| 55 | struct list_head vl_graveyard; /* cell's inactive VL record list */ |
| 56 | spinlock_t vl_gylock; /* graveyard lock */ |
| 57 | unsigned short vl_naddrs; /* number of VL servers in addr list */ |
| 58 | unsigned short vl_curr_svix; /* current server index */ |
| 59 | struct in_addr vl_addrs[AFS_CELL_MAX_ADDRS]; /* cell VL server addresses */ |
| 60 | |
| 61 | char name[0]; /* cell name - must go last */ |
| 62 | }; |
| 63 | |
| 64 | extern int afs_cell_init(char *rootcell); |
| 65 | |
| 66 | extern int afs_cell_create(const char *name, char *vllist, struct afs_cell **_cell); |
| 67 | |
| 68 | extern int afs_cell_lookup(const char *name, unsigned nmsize, struct afs_cell **_cell); |
| 69 | |
| 70 | #define afs_get_cell(C) do { atomic_inc(&(C)->usage); } while(0) |
| 71 | |
| 72 | extern struct afs_cell *afs_get_cell_maybe(struct afs_cell **_cell); |
| 73 | |
| 74 | extern void afs_put_cell(struct afs_cell *cell); |
| 75 | |
| 76 | extern void afs_cell_purge(void); |
| 77 | |
| 78 | #endif /* _LINUX_AFS_CELL_H */ |